Amazon to open cashier-less stores in Chicago, San Francisco

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The logo of US online retail giant Amazon is displayed on the Brieselang logistics center, west of Berlin on November 11, 2014. The center is one of nine in Germany. AFP PHOTO / JOHN MACDOUGALL (Photo credit should read JOHN MACDOUGALL/AFP/Getty Images)

Amazon to open cashier-less stores in Chicago, San Francisco

The logo of US online retail giant Amazon is displayed on the Brieselang logistics center, west of Berlin on November 11, 2014. The center is one of nine in Germany. AFP PHOTO / JOHN MACDOUGALL (Photo credit should read JOHN MACDOUGALL/AFP/Getty Images)

NEW YORK — Amazon, which opened a cashier-less store in Seattle this year, plans more locations in Chicago and San Francisco.

Shoppers enter the stores by scanning a smartphone app. Once inside, they can take soda, salads or anything else off its shelves and just walk out. Amazon’s technology, including overhead cameras, keeps track of what they buy and charges customers after they leave.

Opening more stores is yet another sign that Amazon is serious about expanding its physical presence. It bought grocer Whole Foods last year, which gave it 470 stores, and has opened more than a dozen bookstores.